Sidneioides is a genus of colonial sea squirts, tunicates in the family Polyclinidae.
Species The World Register of Marine Species lists the following species: Sidneioides ivicense Pérès, 1957 Sidneioides japonense Redikorzev, 1913 Sidneioides peregrinus Kremer et al., 2011 Sidneioides snamoti (Oka, 1927) Sidneioides tamaramae Kesteven, 1909
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